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package Reply::Plugin::LexicalPersistence;
use strict;
use warnings;
# ABSTRACT: persists lexical variables between lines
use base 'Reply::Plugin';
use Lexical::Persistence;
=head1 SYNOPSIS
; .replyrc
[LexicalPersistence]
=head1 DESCRIPTION
This plugin persists the values of lexical variables between input lines. For
instance, with this plugin you can enter C<my $x = 2> into the Reply shell, and
then use C<$x> as expected in subsequent lines.
=cut
sub new {
my $class = shift;
my $self = $class->SUPER::new(@_);
$self->{env} = Lexical::Persistence->new;
return $self;
}
sub compile {
my $self = shift;
my ($next, $line, %args) = @_;
my %c = %{ $self->{env}->get_context('_') };
$args{environment} ||= {};
$args{environment} = {
%{ $args{environment} },
(map { $_ => ref($c{$_}) ? $c{$_} : \$c{$_} } keys %c),
};
my ($code) = $next->($line, %args);
$code = $self->_fixup_code($code, \%c);
return $self->{env}->wrap($code);
}
# XXX this is maybe a bug in Lexical::Persistence - it clears variables that
# aren't in its context, regardless of if they may have been set elsewhere
sub _fixup_code {
my $self = shift;
my ($code, $context) = @_;
require PadWalker;
require Devel::LexAlias;
my $pad = PadWalker::peek_sub($code);
my %restore;
for my $var (keys %$pad) {
next unless $var =~ /^\$\@\%./;
next if exists $context->{$var};
$restore{$var} = $pad->{$var};
}
$self->{code} = $code;
return sub {
my $code = shift;
for my $var (keys %restore) {
Devel::LexAlias::lexalias($code, $var, $restore{$var});
}
$code->(@_);
};
}
# XXX can't just close over $code, because it will also be cleared by the same
# bug! we have to pass it as a parameter instead
sub execute {
my $self = shift;
my ($next, @args) = @_;
$next->(delete $self->{code}, @args);
}
1;
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